Abstract: An improved choke assembly for a power electronics device is provided. More specifically, a choke assembly with improved protection from environmental conditions such as dirt and water is provided. An improved choke assembly may include a double layer of protection around an inductor coil of a choke that seals the inductor coil from the outside environment. Another embodiment may include a choke with a projection that seals the cabinet from the cooling channel while allowing the choke leads to pass into the cabinet.

Abstract: An electromagnet and associated apparatus and method are provided. The electromagnet includes a core and at least one winding disposed circumferentially about the core such that the winding extends at least one revolution around the core. The electromagnet further includes at least one spacer having channels defined therein and disposed circumferentially about the core and adjacent to the at least one winding. The channels facilitate cooling by directing fluid about the windings of the coil as fluid is introduced into the electromagnet.

Abstract: A coil form for forming an inductive element (10) includes a coil body (2) and at least one, for example three separating plates (3). The coil body (2) has an opening (4.1) and includes two portions, a coil portion (6) and a flange portion (7). To put the inductive element (10) together, the separating plates (3) are pushed over the coil portion (6) of the coil body (2). For positioning of the separating plates (3), recesses (8) are provided on the surface of the coil portion (6). The separating plates (3) divide the surface of the coil portion (2) into a plurality of coil areas where the coil or the coils of the inductive component (10) can be provided, for example by winding an isolated wire around the coil portion (6) in a coil area. Afterwards, the core of the inductive component is installed by fitting the two E-shaped core parts (11.1, 11.2) together such that the middle leg (13) of each core part (11.1, 11.2) is inserted into the opening (4.1) of the core body (2).

Abstract: A battery-charging system includes a power supply having a high-frequency transformer and is configured to deliver a battery charging power to charge at least one battery. The high-frequency transformer has a bobbin including an elongated top and bottom surfaces and first and second substantially semi-circular end surfaces connecting the top surface with the bottom surface to form an elongated first coil winding surface having a central axis. A first coil is wound around the first coil winding surface, and a second coil is magnetically coupled to the first coil and wound thereto.

Abstract: In a method to produce a curved coil, in particular a sub-coil of a gradient coil for a magnetic resonance apparatus, at least one conductor is wound corresponding to a predetermined pattern on a winding plate, and a winding plate composed of multiple plate elements that are moveable relative to one another is used that is formed into a curved shape after the winding of the conductor, in which curved shape the conductor is fixed while maintaining the curved shape.

Abstract: The invention is directed to a transformer and a method of manufacturing the same, wherein the transformer includes a coil assembly mounted to a leg of a core. The coil assembly includes a low voltage coil and an insulation spool disposed over the low voltage coil. The insulation spool is composed of an insulating material and includes a plurality of guide strips defining a plurality of series of aligned notches. A high voltage coil is mounted to the insulation spool and includes a plurality of disc windings disposed in the series of aligned notches, respectively. Each of the disc windings comprises alternating concentric conductor layers and insulating layers. The conductor layers each have a width to thickness ratio of greater than 20:1.

Abstract: An electromagnet and associated apparatus and method are provided. The electromagnet includes a core and at least one winding disposed circumferentially about the core such that the winding extends at least one revolution around the core. The electromagnet further includes at least one spacer having channels defined therein and disposed circumferentially about the core and adjacent to the at least one winding. The channels facilitate cooling by directing fluid about the windings of the coil as fluid is introduced into the electromagnet.

Abstract: A winding for a transformer or a coil having a ribbon electrical conductor and an insulating material layer composed of ribbon insulation material wound jointly to form turns around a winding core. The individual turns of the winding have a predetermined winding angle with respect to a winding axis of the winding core and are disposed such that they partially overlap one another. An insulating layer is inserted between two radially adjacent layers of the turns. Furthermore, a thickness of the insulating layer is locally matched to the voltage difference determined there. In addition, the thickness of the insulating layer is locally matched, the thickness being interchanged in sequence of the method A+B determined there, to the voltage difference between the two relevant radially adjacent layers at the relevant axial point.

Abstract: A jig (10) is used to form a coil (50) for an electrical machine. A plurality of conductive wires (56), each covered in a heat-curable electrically insulated material, are wound around a bobbin (12). Each succeeding winding in contra-wound relative to the previous winding, with the first turn (16) of each succeeding winding overlaying the last turn (5) of the previous winding. Undeformable electrically insulated inserts (54) are inserted into the windings before heating and compressing the coil (50) in the jig (10).

Abstract: An electrical apparatus includes at least one conductor and an insulation paper surrounding at least part of the conductor. The insulation paper includes a wood pulp fiber, a synthetic fiber, and a binder material. The synthetic fiber is present at between approximately 2 and 25 weight percent.

Abstract: A transformer includes a core defining a core window, a first coil surrounding a portion of the core and including a portion located within the core window, a second coil surrounding a portion of the core and including a portion located within the core window, and a polymer barrier insulation member that is located at least partially within the core window and positioned between the first coil and the second coil.

Abstract: A method of manufacturing an improved comb for a disk wound transformer. The method comprises the steps of providing a web of cellulose material; removing a portion of the cellulose material to create a plurality of longitudinal slits along the length of the web, wherein the longitudinal slits have a fixed length and width; and folding the web along a line proximate the midpoint of the length of each of the longitudinal slits such that the cellulose material adjacent the longitudinal slits defines a plurality of tooth members.

Abstract: A method of assembling a coil includes forming a ferrite core having a top end, a bottom end, an inner opening extending from the top end to the bottom end, a cylindrical outer surface, and a step portion formed near the bottom end, the step portion extending past the outer surface. A first high dielectric material is applied on the outer surface of the ferrite core, then a conductive wire is wound onto the high dielectric material, whereafter a second high dielectric material is applied over the conductive wire.

Abstract: A conductor is wound around a magnetic core to form a plurality of conductor turns. The conductor turns are spaced from one another by a substantially equal spacing d. An insulating layer is disposed between the conductor turns and the magnetic core. An insulating member is wound around the magnetic core in such a manner as to be located in the spaces between and in contact with adjacent ones of the conductor turns.

Abstract: A device configured to be heated to a temperature sufficient to fuse an image forming substance to a sheet includes a hollow roller made of a conductive material and a coil arranged in a hollow portion of the hollow roller. The coil is configured to carry an electrical current that induces a current in the conductive material of the hollow roller such that the hollow roller becomes heated so as to fuse toner to a sheet. The coil is mounted on a member that is disposed in the hollow portion of the roller. The member includes various combinations of features that permit a reliable and safe operation of the induction heating apparatus such as recess and projections formed in the member to separate respective turns in the coil, a hollow center of the member that can be ventilated with a ventilation fan, and predefined gaps being maintained between the inside surface of the hollow roller and an outer surface of the coil.

Abstract: A device configured to be heated to a temperature sufficient to fuse an image forming substance to a sheet includes a hollow roller made of a conductive material and a coil arranged in a hollow portion of the hollow roller. The coil is configured to carry an electrical current that induces a current in the conductive material of the hollow roller such that the hollow roller becomes heated so as to fuse toner to a sheet. The coil is mounted on a member that is disposed in the hollow portion of the roller. The member includes various combinations of features that permit a reliable and safe operation of the induction heating apparatus such as recess and projections formed in the member to separate respective turns in the coil, a hollow center of the member that can be ventilated with a ventilation fan, and predefined gaps being maintained between the inside surface of the hollow roller and an outer surface of the coil.

Abstract: A controllable inductor including at least one tubular core (10), a main winding (5) surrounding the core and a control winding (11) running substantially axially through said core and returning substantially axially outside thereof between said core and said main winding. The control winding is divided into a plurality of separate part control windings (12). The cross section of the part control windings is formed in a way that at least some adjacent part control windings inside the core are separated by means of a spacing (20, 26), which is at least partly defined by substantially parallel surfaces (16, 17) of these part control windings.

Abstract: In order to achieve improved mechanical properties for a coil (1), it is proposed to structure a first electroconductive winding (3) of the coil (1) as a coil former. This coil has a first connecting element (15), to which a second connecting element (17) is attached via an insulating part (25). The two connecting elements (15, 17) form the connections for the coil (1). In this way, a self-supporting coil structure is achieved. The coil (1) is particularly intended as an undervoltage winding with a low number of windings for cast resin transformers.

Abstract: A low loss composite spider arrangement for use in inductive electrical epment and an air core reactor incorporating the same in which a non-conductive or a conductive material having very low relative permeability and relatively high resistivity is used to fulfill the mechanical and structural requirements of the spider, and a relatively small amount of electrical conducting material, bonded to and preferably electrically isolated therefrom, is used to fulfill the electrical requirements of the spider.

Abstract: A winding for a transformer or choke coil wherein successive turns are arranged onto each other in radial direction. To provide for optimal cooling conditions axially extending cooling channels are provided by placing spacers between the successive radial turns of the winding. To provide for a limited volume, the turns which are adjacent to each other in the axial direction are located directly onto each other without interspacing.

Abstract: A heating device, such as a heating coil for use in apparatus to be heated, has a removable flexible strip carrier which enables the coil, already supported on ceramic insulators and carried by brackets, to be readily installed in the apparatus. The disposable or reusable strip carrier is notched for supporting the insulators and is easily removed after installation of the device.

Abstract: In a method of manufacturing a heating coil assembly for electromagnetic induction cooking heater in which a coil supporting base and a flat shaped coil winding frame are mounted on the spindle of a coil winding machine in such a manner as to form a coil receiving space therebetween, and a wire is wound in the space to form a coil, the coil supporting base and/or the coil winding frame has protrusions which extend in the space at the middle part, to vary the coil winding pitch, whereby the coil thus formed has a gap at the middle part, thus showing a uniform temperature distribution when energized.

Abstract: A spherical transformer and process for forming same is set forth. Hollow, hemispherical elements are rotated to enable a cooperating cutting tool to impart a helical impression therein. An adhesive is sprayed into the interiors of both hemispheres and thereafter powdered metal, such as stainless steel, is directed thereon to form a sheet-like core that when both hemispheres are joined to provide an uninterrupted metal core with said hemisphere. A primary winding is inserted into the aforenoted grooves about one hemisphere and a secondary winding is positioned into the helically cut grooves in said second hemisphere. The thusly formed transformer is positioned on a base for a stability thereof.

Abstract: In a crossed-coil rotating-magnet measuring instrument having an approximately cylindrical core developed as winding form, a first and second coil are wound crossed one above the other. The second coil is necessarily arranged over the first coil in the regin of the ends of the winding form and thus has a greater height of winding than the latter. Within the core there is also provided a rotating magnet whose pointer shaft is extended out of an extension of the core. In order to reduce the linearity error of this measuring instrument and to permit a reading over several quadrants, spacer means are provided on the core for guiding turns of the coil spaced from the extension of the core around the latter in a rectangular plane in each case.

Abstract: In a vacuum induction furnace provided with an induction coil, surrounding a furnace crucible, the coil includes a plurality of intermediate layers inserted between the individual windings, and spacer elements also inserted between the individual windings, next to the intermediate layers and at the side of the coil facing the crucible. The spacer elements are formed of insulating material.

Abstract: An axially symmetric air-core choke coil for high voltage applications. The coil includes a plurality of radially concentric, helically wound layers of windings. Non-insulated wire cable is used to produce each winding. Therefore, adjacent turns of each winding, as well as adjacent layers are spaced from one another. Separation between adjacent turns of each layer is provided through longitudinally extending, non-conductive, strips which are circumferentially spaced around the outer periphery of each winding layer. The strips are folded radially inward at the open spaces between turns. The layers are separated by a plurality of longitudinally extending non-conductive bars. The bars can be positioned to overlap the strips. Numerous air gaps are thereby defined between adjacent turns and adjacent layers which allow air to easily flow in a radial direction into the center of the air-core coil.

Abstract: The present invention discloses a modular reactor that increases the inductance per axial length by winding a conductor circumferentially about a central axis in a manner which results in radially extending columns which are sequentially wound in alternating radial order. The modules are constructed to allow them to be combined in either radial or axial juxtaposition and electrically connected either in series or in parallel.

Abstract: A high voltage reactor includes a plurality of angularly spaced columns for supporting the layers of a disk winding in vertically spaced relation. Each of the columns is comprised of a monolithic casting of an insulative material and pairs of angularly spaced, rigid plastic casting forms disposed between each winding layer. The form pairs are in vertical alignment to establish requisite layer-to-layer and turn-to-turn separations, as well as to provide the sidewalls of a casting mold utilized in forming the column. The forms thereafter remain in place to constitute the column sidewalls.

Abstract: A coil form for a transformer having air-cooled electric windings. Plug-in frames which can be adjusted in width and/or height are provided at the ends of the device. Profiled bars and additional supporting members, both of which can be of any desired length, are mounted between the frames at each corner thereof and are laterally spaced so as to space the coil windings wrapped therearound.

Abstract: A one-half turn inductor is formed in a mold having a series of spaced ribs forming grooves therebetween, a U-shaped coil has its bight portion positioned in a selected one of the grooves corresponding to the inductance value of the inductor with the legs of the coil projecting beyond the cavity. Plastic is introduced into the cavity to create a coil form with the coil embedded in the plastic. The ribs and grooves form an inspection window consisting of spaced parallel rungs, one of said rungs being an exposed segment of the coil, the remainder being plastic.

Abstract: The present invention preferably comprises a modular air core coil inductance assembly which is comprised of a plurality of spiral windings which are magnetically coupled to each other and disposed in planes which are orthogonal to the longitudinal axis of the resultant air core coil. The modular air core coil assembly may preferably comprise a plurality of air core coil subassemblies each of which preferably comprises at least one spiral winding disposed on a winding support member, with the winding preferably being an electrical conductor wound in the shape of an Archimedes spiral disposed in a plane orthogonal to the longitudinal axis of the coil; a fixing or holding member which is disposed facing the spiral winding in order to set or hold it in position; at least two shields fixed on the coil ends in order to prevent magnetic coupling between the different coils; and at least two spacing members disposed so as to obtain the desired distance between the shield and the winding.

Abstract: In winding the stator of a long stator linear motor without iron, the conductors of the traveling wave winding in the stator are designed as round jacketed lines which are fixed to a non-magnetic winding support by cross-bars and retained in place by hardenable non-magnetic material. The conductors of the traveling wave winding are approximately flush with the outside surface of the stator which is disposed opposite an exciter magnet on a moving vehicle.

Abstract: Method of bracing winding end turns of an electric machine includes wrapping a first binding tape transversely around a pair of winding bars forming the end turns and disposed spaced from and substantially parallel to one another, wrapping a second binding tape transversely about the wrapped first binding tape in the space between the pair of winding bars so that the wrapped first and second binding tapes and the mutually opposing surfaces of the parallel winding bars define an inner space within, and injecting a flowable, cold hardenable cement mass into the inner space, and introducing into the space between the winding bars at the location of the inner space subsequently defined by the wrapped first and second binding tapes and the winding bars, and before injecting the cement mass into the inner space, a spacer member defining and predetermining the spacing between the pair of winding bars and having a shape that affords penetration of the cement mass from a given point of injection to all of the spaces a

Abstract: An improved normal or superconductive field coil constructed so that individual coils are both axially and radially stable. The individual coils are provided with a holding cylinder at each end with the conductor ends being fixed to the holding cylinder. In another embodiment an electrically insulating, reinforcing cylinder is fixed to the outer periphery of the coil.

Abstract: A coil assembly is formed by an elastic metal wire helical extension spring coil having convolutions resiliently urged towards each other and held apart by spacers pinched between the convolutions and held there by the spring-back of the convolutions. The spacers can interspace the coil convolutions and be made to extend radially inwardly and outwardly beyond the inside and outside of the coil, so as to radially space the coil from a coil center and the inside of a tubular casing enclosing the coil. In this way a tubular radiant heater can be made by using electric resistance wire to form the coil and making the spacers from refractory insulating material.

Abstract: A magnet winding method is provided wherein the individual pancakes are fabricated such that adjacent pancakes have oppositely spiraled grooves that begin and end at the same relative locations on the pancakes. Holes through the pancakes are provided at each end of the spirals that permit winding the entire magnet without a single splice.

Abstract: A cylindrical coil form, for magnetic coupling with an irradiated nuclear magnetic resonance gas sample, is provided with peripheral and longitudinal grooves. The peripheral grooves are not helical in form, but are perpendicular to the axis of the coil form to give a precisely directed longitudinal magnetic field. A first coil for providing strong magnetic coupling along the axis of the coil form is wound in the peripheral grooves, the adjacent turns being interconnected by short longitudinal sections of wire in one of the longitudinal grooves. Additional coils are provided for magnetic coupling transverse to the axis of the coil through the use of wires extending down one of the longitudinal slots and back in another longitudinal slot. The form may be of phenolic material, or may be transparent so that the nuclear magnetic resonance sample may be irradiated directly through the coil form.